The event is held to raise awareness for sustainable energy and for “responsible living, human-powered transport” as opposed to cars and buses. Bikers and skateboarders, made up the majority of the participants.

Organizers say the event is legal in Los Angeles “as long as it is nude and not lewd.”

KNX 1070’s Megan Goldsby said the event was two things — “incredibly friendly, and it’s also perfectly legal which not everyone knows.”

Body painting is also a big part of the event, but not required.

Participants gathered near Union Station (the exact location is only revealed the day before the event, for security and safety reasons, say the planners) and rode around downtown for 15 miles, or about 2.5 hours.